{"trustable":true,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"panel_content\"\u003eThere\u0027s a matrix of n rows and m columns whose elements are either 0 or 1. \u003cbr\u003eIf an element is 0, it is located at the i-th row and j-th column, there is at least one 1 is located at the i-th row and k-th (k \u0026lt; j) column, and at least one 1 is located at the i-th row and r-th(r \u0026gt; j) column, this element is called Cup.\u003cbr\u003eYou can swap any two rows and any two columns of the matrix. You can do this infinite times, to minimize the number of Cups.\u003cbr\u003e\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"Multiple test cases (no more than 50), ended with EOF.\u003cbr\u003eThe 1st line of each test case contains two integers n and m (3 ≤ n ≤ 10, 3 ≤ m ≤ 25), the number of rows and the number of columns of the matrix.\u003cbr\u003eThen following n lines, each line has m space-separated 0 or 1, indicating the original configuration of the matrix.\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"For each test case output a number in one line, indicating the number of minimum Cups can be obtained after the swapping operations."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3 3\r\n1 1 0\r\n1 0 1\r\n0 1 1\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e1\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}